2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-27

  • question_answer
    The half cell reactions of the cells used in hearing aids are \[Zn\xrightarrow{{}}Z{{n}^{2+}}+2{{e}^{-}}\]     \[({{E}^{o}}=+0.76\,V)\] \[A{{g}_{2}}O+{{H}_{2}}O+2{{e}^{-}}\xrightarrow{{}}2Ag+2O{{H}^{-}}\] \[({{E}^{o}}=0.34\,V)\] \[{{E}^{o}}\] of the cell will be

    A)  \[1.1\,V\]             

    B)  \[0.42\,V\]

    C)  \[0.84\,V\]                  

    D)  \[3.2\,V\]

    Correct Answer: A

    Solution :

    \[Zn\xrightarrow{{}}Z{{n}^{2+}}+2{{e}^{-}}\]  ,         \[{{E}^{o}}=+0.76V\] \[A{{g}_{2}}O+{{H}_{2}}O+2{{e}^{-}}\xrightarrow{{}}2Ag+2O{{H}^{-}}\],  \[{{E}^{o}}=0.34V\] Adding,      \[E_{cell}^{o}=0.76+0.34\]                         \[=1.10V\]      


You need to login to perform this action.
You will be redirected in 3 sec spinner